I'm using AD7176-2 to develop audio analyzer and analyze single-end signal THD. It is weird if I exchange the channel register setup of positive/negative, then I will get different THD performance (by Matlab FFT).
I'm sorry what register do you mean? ODR is set using FILTCON register (0x28-0x2B) and this is a 16 bit register only. Unless you meant write 0x0060 to 0x28 or write 0x8060 to 0x28 but not sure if you written that correctly.
There are various supply requirements for the AD7176. The user guide UG-478 U3, uses ADM1185ARMZ-1, a Quad voltage monitor and sequencer. It appears power sequencing is required, can ADI please confirm or comment